I believe the magic lies in the chilling. I've never let cookie dough chill since I'm a kinda impatient type so if I'm making something I want to finish it right away. As I'm getting older and of course wiser (:P) I noticed that patience will really get me a long way.
So I advise chill the dough at least 6 hours but the longer the better. My leftover dough is still sitting happily in the fridge waiting for the big moment when dough becomes cookies :)
1/5 teaspoon baking soda
3/4 teaspoon salt
150 grams(2/3 cup) butter
250 grams(2/3 + 1/2 cup) raw cane sugar
1 teaspoon vanilla extract
chocolate chips, as much as you like
Whisk the flours, baking powder, baking soda and salt together in a medium bowl and set aside. Cream the butter with the sugar on medium speed until fluffy. Add the egg and then the vanilla and blend together. Then add in the dry ingredients, mix and in the end add the chocolate chips. Cover the bowl and put it in the fridge and let it chill for half a day to 2 days.
When the dough chilled, form small balls and place them on a baking sheet covered with parchment paper. Bake them for 12 minutes on 180C (360F).